Casting apparatus



5Pt 10, 1929. R. oE'rTlNGER CASTING APPARATUS Filcd Jan- 12, 1928 2 Sheets-Smet mvENToK M @WM QM Rf TY.

Sept. 10, 1929. IR. oETrlNGl-:R

CASTING APPARATUS Filed Jan. 12, 1928 2 sheets-sheet 2 mmm-fmt Patented Sept. 10, 1929.-

PATENT oF A:RICHARD OETTINGEB, F MUNICH, GERMANY.

casrnm ArrAmTUs.

lApplication med .namuary` 12, 1492s, serial no.

The casting apparatus herein described has-for its purpose, and achieves the com l plete filling up of casting lmoulds, without any loss of material, and the attainin of an' excellent homogeneity of certain alibys of gold in the direct castin process. Therefore it is particularly suited orcasting work pertaining to dental surgery, jewelry, trinkets, etc. f

1 The new apparatus makes it possible that in casting, centrifugal force, as well as air and steam pressure, can operate at the same time. A

The invention comprises a lid sliding easily on two rods holding the pan, said lid covering the pan and the cuvette, placed in the middle of the pan inthe manner of a boxcover, immediately after the casting process is started;. convenient means are rovided for holding the lid up near the hand e before the casting. i

The accompanying drawings show by way of example two forms of execution o'a new castingA apparatus according to the invention. Figure 1 is a view of the rst form of execution before the casting,

FigureQ after the casting; Figure 3 is a vertical section of the apparatus.

Figure 4 is an enlarged view of a .part of the same. Y

, Figure 5'is a view of the casting cuvette. Figure 6 shows the second form of, execution of the apparatus. Figure 7 is an .enlarged view o f a part of the same, partly in section.

The first/form of execution (Figs. 1-5) may be used in the fabrication of smaller objects, such as inlays, hridgework, or smaller plates in' dental surgery, and for smaller ornaments generally. 1

The second form (Figs. 6 and 7) may be used in the fabrication of large plates of v4teeth or larger trinket-s.

' The construction of the casting apparatus has retained -the outer frame-'of the wellknown casting-sling, viz, a 'pan 1, held by twe rods 2, connected by a bow "3. A heavywire 4 is jointed onl one end to the middle 246,194, and in- `Gerlixan'y September23, 1926.

o f this bow and on the other end to the handle .5, by which Ithe apparatus canbe rotated in the usual .wa So far the construct1on corresponds 4to t e well-known sling.

According to the invention', a cover 6 has.

been interposedv as a falling 11d between'pan 1 and bow 3. The aperture of lid 6 is turned towards the aperture of an 1, the vdiameter of lid 6 being smaller t an that of pan 1.

Small eyelets or short tubes 7 are fitted to the side of lid 6` and la small hook 8 to the top on the outside of the same, correspond- FICE.

ing to a second hook 9, attached to bow 3.

Between these two' small hooks 8 and 9 a spring or small india-rubber ring is fixed, holding the lid 6 lnear the bow 3. The ap-A paratus is expediently provided with two lids of different sizes, so that a smaller or llarger lid can be .used as required.

The changing and inserting of the-larger or smaller lids between bow and pan ismade possible by the feature that the upper part vof the slingcan be taken-apart, -as Figure 4 illustrates on a larger scale. Figure 4 shows the end of the threaded rod'2, of smaller diameter for insertion into bow 3, lwhich can be secured by a screw socket 11.

In the casting process lid 6 falls onto pan 1 by rotating the apparatus on account of the centrifugal force and fits tightly over the pan box-fashion. The rubber` ring breaks during the casting,l Figure 3 shows that asbestos packings 12 which are fitted into the top of lid 6, which rests on the upper rim of `the cuvette 13, close the latter. Figure 3 shows further that two `pins'14 are attached to the pan. i

Casting cuvettes of special shape serve as accessories for the casting apparatus y(Figl 5). The mould can have,for instance, the following form. A short t'ube 13 -is xed td a'iiange v15 containing -two-bores 16, so that the cuvette can be inserted over said pins fixed to the pan, and fits securely. Thevcuvettes are'in stock in rolind and oval/shape and in all necessary heights `and diameters.

Accordin to the second ,form of (Figs. 6 am? an axle 19 is screwed to a'table 18 (or attached to a wall) by means of a holdingl dev1ce`17. Axle 19 is contained in a tube execution 19a, to which a lever 2O is attached, which is provided with a handle 21, as well as with a slidable -counterweight 22. Opposite to the lever 20 two heavy iron rods 23 are attached.

Furthermore a second handle 24 is attached to the tube 191- containing the axle 19. Bow 3 connecting the two carrying rods 2 is swingably attached `to the ends of rod 23, said axle 3 being easily detachable. .For this purpose pins 26 can be inserted through cross-bores 25 of rods 23 into axial bores 27 on the ends of aXle 3, thereby holding the latter, as illustrated in Fig. 7 on an enlarged scale. The securing of the pins 2G is accomplished by clamping-screws 28, which are inserted in threaded bores 29 of the ends of the iron rods 23.

'The other parts of this casting apparatus are constructed in the same way as those of -the first form, illustrated in Figs. l-.

Both forms of casting apparatus described herein show important improvements 1n com arison to the castin t a iaratus. )re- Y in the mouth, on being used for dental purposes, and which contain only very few holes, so that ay cast for dental purposes possesses the necessary resistance against the chewing pressure.

The essential part of the construction, the provision of a falling lid, brings it about that the cuvette is entirely closed by the box-like combination of the falling lid with the pan, thereby preventing the airfrom entering the cuvette, thus lowering the high temperature of the cuvette slowly and regularly.

The result of this is, that the molten alloy is enabled to form crystals of homogeneous structure. Y

Y The pressure caused by the falling of the -lid is used in different ways according tothe use of gold alloys. For gold-alloys the airpressure alone is made use of, which is originated by the falling of the lid onto the pan.

In slowly flowing metals a steam-pressure is employed. In this case the asbestos packing in the to of the lid is moistened. When the cover fa ls onto the hot cuvette, steam is produced, the pressure of which acts in addition to the centrifugal force.

What is claimed as new is 1. In a casting device, the combination with a fiask having an open top adapted to receive molten material, and means for centrifugalizing said flask to cause said material to flow downwardly from said top; of a lateral flange on the flask bottom, and means for automatically causing a closure of said top after said centrifugalization is initiated; said last-named means including a cover mounted lfor movement in a radial direction, said covercomprising a top wall and depending side walls adapted to engage withl said flange.

2. In a casting device, the combination with a pan, a flask adapted to rest thereon and having an open top for the reception of molten material, and means for centrifugalizing said pan and flask to cause said material to flow downwardly from said top; of means forvsecuring said flask to the pan in a predetermined position, said means comprising pins on said pan and a complementary bored flanged on said` flask adapted to engage over said pins.

3. In a casting device, the combination with a sling comprising a pair of rods, a bow at one end and a pan at the other, a flask adapted to rest on said pan and having an open top adapted to receive molten material, and means for centrifugalizing said sling to cause said material to flow downwardly from said top; lof means for automatically causing a closure of said top after said centrifugalization is initiated; said last-named means comprising a cover slidably mounted on said rods over said pan.

4. In a casting. device, the combination with a sling comprising a pair of rods, a bowat one end and a pan at the other, a flask adapted to rest on said pan and having an open top adapted to receive molten material, and means for centrifugalizing said sling to cause said material to flow downwardly from said top; of means for automatically causing a closure of said top after said centrifugalization is initiated; said last-named means comprising a cover slidably mounted on said rods over said pan, and means yieldable under centrifugal force for normally holding said cover off of said flask, said yieldable means comprising an element extending between said cover and said bow.

5. In a casting device, the combination with a sling comprising a pair of rods, a bow at one end and a pan at the other, a flask adapted to rest on said pan and having an open top adapted to receive molten material, and means for centrifugalizing said sling to cause said material to flow downwardly from said top; of a cover slidably mounted on said rods,

and means for removably securing said bow to said rods, whereby the cover may be withdrawn entirely from said rods.

In testimony whereof I hereunto afiiX my RICHARD OETTINGER.

slgnature.

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